Water-heating furnace.



I No. 708,2l7.

H. A. FRASER.

WATER HEATING FURNACE.

Patented Sept. 2, !902.

[Application filed Apr. 14, 1902.)

to Model.)

W "Q QM INVENTOR ATTORNEY Wnmssas: Y 4 Q UNITED STATES PATENT OFFICE.

HUGH A. FRASER, -or SARNIA, CANADA.

WATER-HEATING FURNACE.

SPECIFICATION forming We of Letters Patent No. 708,217, dated September 2, 1902.

Application filed April 14, 1902.

To wZZ whom it may concern:

Be it known that I, HUGH A. FRASER, a citizen of the United States, residing at Sarnia, in the Province of Ontario and Dominion of Canada, have in vented certain new and useful Improvements in Water-Heating Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enableothers skilled in the art to whichit appertains to make and use the same.

This invention is a water-heatingand steamgenerating furnace especially adapted for warming buildings and for similar service.

The improvements consist in the novel construction of. the furnace-shell, the arrangement of the Water-heating surfaces, and in the means for deflecting and guidingthe hot furnace-gases, so as to bring them intimately into contact with the entire area of both the; inner and outer surfaces of the-water-spac'es and with the main conducting-pipe;

The invention is illustrated in the accompanying drawings, in which-- Figure 1 is a side elevation of the furnace with the outer jacket or casing removed, the upper part being broken away to show a partsectional view on the line 00 x of Fig. 3. Fig. 2 is a top plan View of the furnace with its outer casing removed. Fig. 3 is a front elevation of the furnace, the upper part being broken away to show a transverse section on the line y y of Fig. 1.

As is clearly shown in the drawings, the fur.- nace consists in a hollow water-containing shelll,its cross-sectional shape being substantially that of an inverted'letter U. The shell 1 has a hollow water-containing end 2, which forms the back for the combustion-chamber 3. An opening 4: through the shell 1 near its rear end permits the gases to escape into the space between the shelll and an outer'jacket or casing 5, which surrounds the shell 1 and corresponds with it in general shape. The main pipe 6, through which the steam or hot Water is delivered for distribution'through the building, communicates with the waterspace of the shell 1 near its front end and extends rearwardly above the opening 4, so as to receive the impact of the hot gases. A pair of deflecting-plates 7 extend horizontally around the lower part of the shell 1 and its back 2 and form a'horizontal deflecting-plate Serial No. 102,797. (No model.)

. or partition spanning the space between the hollow shell 1 and the outer casting 5. The deflecting-plates are discontinued near the frontof the furnace, leaving openings 8 at each side through which the products of combustionrpass downwardly on their way to the and rearwardl-y, sweeping over the outer heating-surfaces of the top and side of the shell '1." Thegases then pass down through the openings 8 and thence back under the partitions 7, around the return-pipes 11, and out through the smoke-pipe 9 into the chimney, To thoroughly heat the outer surface of the water-back 2, I provide openings 12 through the partition 7 in proximity to the smoke-pipe outlet. A flow of hot gases from the openings 4: is induced by the chimneydraft down the back 2 and into the pipe 9 through the openings 12, thoroughly heating the water in the back 2. In practiceI prefer to cast the shell 1 in a single piece, thereby not only reducing the cost of manufacturing but also doing away with joints, that might in practice develop leaks.

By the means above described I haveproduced ,a heating-furnace that is simple in construction, having its entire water-containing space inclosed by a single casting and so disposed with reference to the firebed that the gases of combustion traverse the entire areaof the water-space both inside and out and also flow around the main distributing-pipe. I thus secure a large area of highly-efficient heating-surface in a furnace requiring a relatively small amount of 'metal for its construction.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. A water-heating furnace comprising in combination an inner water-containing shell of inverted-U section; an outer casing inclosing said shell; an opening through the top of the water-containing shell near its rear end, connecting the combustion-chamher with the space between the shell and the casing; a horizontal deflecting-plate extending around the lower part of the shell and connecting the shell and easing; openings near the front ends of said deflecting-plate; a smoke-pipe communicating with the interior of the casing below said deflecting-plate; and openings in the deflecting-plate in proximity to the smoke-pipe, for the purposes set forth.

2. In a furnace the combination of a combustion chamber inclosed by an inverted water-containing shell of substantially U- shaped section having a water containing end, said shell and end being formed in one HUGH A. FRASER.

Witnesses:

GEO. S. CLARKE, T. W. HUSHIN. 

